51503120232 has 16 divisors (see below), whose sum is σ = 128757800640. Its totient is φ = 17167706736.

The previous prime is 51503120171. The next prime is 51503120237. The reversal of 51503120232 is 23202130515.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 2145963343 = 51503120232 / (5 + 1 + 5 + 0 + 3 + 1 + 2 + 0 + 2 + 3 + 2).

It is not an unprimeable number, because it can be changed into a prime (51503120237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072981648 + ... + 1072981695.

It is an arithmetic number, because the mean of its divisors is an integer number (8047362540).

Almost surely, 2^51503120232 is an apocalyptic number.

It is an amenable number.

51503120232 is an abundant number, since it is smaller than the sum of its proper divisors (77254680408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51503120232 is a wasteful number, since it uses less digits than its factorization.

51503120232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145963352 (or 2145963348 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 51503120232 its reverse (23202130515), we get a palindrome (74705250747).

The spelling of 51503120232 in words is "fifty-one billion, five hundred three million, one hundred twenty thousand, two hundred thirty-two".